package demo4;

public class Keyboard implements USB{

    @Override
    public void openDevice() {
        System.out.println("打开键盘服务！");
    }

    @Override
    public void closeDevice() {
        System.out.println("关闭键盘服务！");
    }
    public void input(){
        System.out.println("输入文字！");
    }
}
